Minikin is changing its approach to table access to use HarfBuzz to access the tables, based on raw font data, rather than calling the MinikinFont::GetTable() virtual method. This patch provides raw access to the font data to make this work. There's a bit of plumbing to make sure fonts get a pointer to the raw data as well. Bug: 27860101 Change-Id: I638e18cf363644bf22fbc9fb9b3358a9e731087f